OXTSTOMATOUS AND ALLIED CRABS OF AMERICA 135 



Off Angel de la Guardia Island, Gulf of California; lat. 29°30'00" 

 N., long. 112°40'00" W.; 45 fathoms; 1880-82; Comdr. H. E. Nichols, 

 U.S. N.; 1 male (17503). 



EBALIA ROTUND ATA (A. Milne Edwards) 



Plate 36, Figures 9-12; Plate 37, Figures 4, 5 



Lithadia rotundata A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, p. 22, 1880 

 (type locality, mouth of the Bermejo, Patagonia; type, M. C. Z.no. 6662). — 

 A. Milne Edwards and Bouvier, Mem. Mus. Comp. Zool., vol. 27, p. 113, 

 pi. 22, figs. 6, 7; pi. 23, figs. 1, 2, 1902. 



Diagnosis. — Carapace octagonal, without lateral teeth. Carapace 

 hollowed out about cardiac region. 



Description.— Smi&ces everywhere covered with flat, adjacent 

 granules delimited by raised lines; on the digits, especially those of 

 the ambulatories, the granules are replaced by spinules. Carapace 

 wider than long, octagonal, sides unequal, margins thick. Front 

 narrow, faintly bilobed. The anterolateral margins are the longest 

 and have two obtuse prominences, one at level of hepatic region, the 

 other more feeble and a Httle behind; lateral margins half as long as 

 anterolateral, converging posteriorly and slightly concave; postero- 

 lateral margins a little longer than the preceding and also concave; 

 posterior margin twice as wide as front, having a broad sinus and two 

 shallow lobes, more pronounced in male. The branchial regions are 

 the most elevated portions of the carapace. The hepatic region is 

 very convex above and below; not toothed below but more prominent 

 in female than in male; dorsally it is surrounded by a depression. 

 Cardiac prominence wider than long, oblong, with rounded corners 

 and connected by a transverse Hne with the urogastric region. It is 

 otherwise surrounded by a depression, on which are some isolated 

 mushroom-shaped granules; it is narrow and shallow behind but 

 becomes deeper on the anterior border, where it is divided into two 

 lobes by reason of a prominence from its outer border which projects 

 in the direction of the anterior cardiac angle. Third and fourth 

 segments of male abdomen with three blunt longitudinal carinae; 

 sixth segment with an acute spine at proximal end, pointing backward. 

 Sternum with four deep transverse grooves. 



Measurements of coty pes.— M&Ig, length 9.9, width 10.1 mm.; female, 

 length 8.5, width 9.1 mm. 



Material examined. — I^own only from the two cotypes (c? and 

 $ ) from off Bermejo Head, Patagonia, lat, 47°17' S., long. 63° W., 

 17 fathoms, March 4, 1872, station 28, Hassler (M. C. Z, no. 6662). 



